/*******************************************************************************
 * Copyright (c) 2004 Vlad Dumitrescu and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Vlad Dumitrescu
 *******************************************************************************/
package org.erlide.util.erlang;

import org.eclipse.jdt.annotation.NonNull;

import com.ericsson.otp.erlang.OtpErlangObject;
import com.ericsson.otp.erlang.OtpOutputStream;
import com.google.common.base.Preconditions;

/**
 * Provides a Java representation of Erlang variables.
 * <p>
 * <b>!!! These are to NOT to be sent to an Erlang node !!!!</b> Their use is in
 * pattern matching only.
 */
public class OtpPatternVariable extends OtpErlangObject {

    private static final long serialVersionUID = -1L;

    private final String name;
    private Signature sign;

    public OtpPatternVariable(final @NonNull String n) {
        Preconditions.checkArgument(!n.isEmpty());
        final String[] v = n.split(":");
        name = v[0];
        if (v.length > 1) {
            sign = new Signature(v[1].charAt(0));
        } else {
            sign = new Signature('x');
        }
    }

    public String getName() {
        return name;
    }

    public Signature getSignature() {
        return sign;
    }

    @Override
    public String toString() {
        return "'%" + name + ":" + sign.kind + "'";
    }

    @Override
    public boolean equals(final Object o) {
        if (!(o instanceof OtpPatternVariable)) {
            return false;
        }

        final OtpPatternVariable l = (OtpPatternVariable) o;
        return name.equals(l.name) && sign.equals(l.sign);
    }

    @Override
    public int hashCode() {
        return name.hashCode() + sign.hashCode() * 31;
    }

    @Override
    public void encode(final OtpOutputStream arg0) {
        // throw new NotImplementedException();
    }

}